WASHINGTON, March 6 (INP) The US has not seen a “decisive and sustained” change in the behaviour of Pakistan, even after the Trump Administration announced a $2 billion security assistance freeze to Islamabad nearly two months ago, a senior American official said on Tuesday. “We’ve not seen decisive and sustained changes yet in Pakistan’s behaviour, but certainly we are continuing to engage with Pakistan over areas where we think they can play a helpful role in changing the calculus of the Taliban,” .................. INP/AH